maximum number

While administrating a box, you may wanted to find out what a processes is doing and find out how many file descriptors (fd) are being used. You will surprised to find out that process does open all sort of files:
=> Actual log file

=> /dev files

=> UNIX Sockets

=> Network sockets

=> Library files /lib /lib64

=> Executables and other programs etc

In this quick post, I will explain how to to count how many file descriptors are currently in use on your Linux server system.

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You should always aware of maximum amount of memory and maximum number of CPU supported by Linux systems / server.

This is an essential task for making out decisions. You must consider at least AMD and Intel platforms, tested under RHEL 5 only:

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Q. I would like to restrict number of CPU activated for some software licensing issues under Linux kernel 2.6.xx.. How can I limit the number of CPUs activated in SMP mode? A. Pass a special parameter called maxcpus to kernel. It specify maximum number of processors that an SMP Linux kernel should make use of. […]

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